202202200220021 has 2 divisors, whose sum is σ = 202202200220022. Its totient is φ = 202202200220020.

The previous prime is 202202200220003. The next prime is 202202200220023. The reversal of 202202200220021 is 120022002202202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 199565376351121 + 2636823868900 = 14126761^2 + 1623830^2 .

It is a cyclic number.

It is not a de Polignac number, because 202202200220021 - 2⁴⁶ = 131833456042357 is a prime.

It is a Sophie Germain prime.

Together with 202202200220023, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202202200220023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101101100110010 + 101101100110011.

It is an arithmetic number, because the mean of its divisors is an integer number (101101100110011).

Almost surely, 2^{202202200220021} is an apocalyptic number.

It is an amenable number.

202202200220021 is a deficient number, since it is larger than the sum of its proper divisors (1).

202202200220021 is an equidigital number, since it uses as much as digits as its factorization.

202202200220021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 17.

Adding to 202202200220021 its reverse (120022002202202), we get a palindrome (322224202422223).

The spelling of 202202200220021 in words is "two hundred two trillion, two hundred two billion, two hundred million, two hundred twenty thousand, twenty-one".